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Girgaon, Mumbai - 400004
Stainless Steel Seamless Tubes Manufacturer in India
Stainless Steel Seamless Tube Manufacturer in India
Kamal Steels is a leading Stainless Steel Seamless Tubes Manufacturer in India, supplying high-quality stainless steel seamless tubes and stainless steel tubing for industrial, commercial and engineering applications. Established in 1984, we have decades of experience in manufacturing and supplying stainless steel tubing solutions to domestic and international customers.
We offer a wide range of SS Seamless Tubes in different grades, sizes, thicknesses and specifications to meet diverse industrial requirements. Our stainless steel seamless tubing products are widely used in oil & gas, petrochemical, chemical processing, pharmaceutical, food processing, heat exchangers, instrumentation and engineering industries.
Our Stainless Steel Seamless Tubes are manufactured using premium quality raw materials and advanced manufacturing processes to ensure superior corrosion resistance, high tensile strength, smooth finish and long service life. All tubes are supplied according to international ASTM, ASME and ANSI standards with strict quality testing and inspection procedures.
As trusted seamless tube manufacturers in India, we provide stainless steel seamless tubes with accurate dimensions, smooth internal finish and reliable performance for high-pressure and high-temperature applications. Our commitment to product quality, competitive pricing and timely delivery has made Kamal Steels a preferred supplier in the stainless steel tubing industry since 1984.
Why Stainless Steel Seamless Tubes?
Stainless steel seamless tubes are manufactured without any welded joints, providing superior strength, corrosion resistance and pressure handling capability. These tubes are produced using extrusion and rotary piercing processes, making them highly reliable for critical industrial and engineering applications.
Stainless steel seamless tubes are preferred for applications requiring precision dimensions, smooth internal finish and excellent structural integrity. Their ability to perform efficiently under high temperature, pressure and corrosive environments makes them suitable for heat exchangers, instrumentation systems, chemical processing, oil & gas and pharmaceutical industries.
Why Choose Kamal Steels?
- Manufacturer & Stockist Since 1984
- Large Ready Stock Available
- ASTM & ASME Standard Tubes
- Third Party Inspection
- Mill Test Certificates Provided
- PAN India & Export Supply
- Competitive Prices
- Fast Delivery Support
Stainless Steel Seamless Tube Specifications
| Product Name | Stainless Steel Seamless Tubes |
|---|---|
| Brand | Kamal Steels |
| Material | Stainless Steel |
| Type | Seamless Tube |
| Form | Round, Square, Rectangular |
| Outer Diameter | 6 mm to 219 mm |
| Wall Thickness | 0.5 mm to 25 mm |
| Length | Single Random, Double Random, Cut Length |
| Tube End | Plain End, Beveled End |
| Surface Finish | Annealed, Pickled, Polished, Bright Annealed |
| Standards | ASTM A213, ASTM A269, ASTM A249, ASME SA213 |
| Tube Schedules | SCH 5S to SCH 80S |
Technical Overview
Our stainless steel seamless tubes are suitable for applications requiring precision dimensions, excellent corrosion resistance and reliable mechanical performance. These tubes are widely used in instrumentation systems, heat exchangers, condensers, hydraulic systems and critical process applications where seamless construction is preferred.
Available Grades of Stainless Steel Seamless Tubes
Kamal Steels manufactures the following grades of stainless steel seamless tubes:
- Stainless Steel 304 Seamless Tubes
- Stainless Steel 304H Seamless Tubes
- Stainless Steel 304L Seamless Tubes
- Stainless Steel 310 Seamless Tubes
- Stainless Steel 310S Seamless Tubes
- Stainless Steel 310H Seamless Tubes
- Stainless Steel 316 Seamless Tubes
- Stainless Steel 316L Seamless Tubes
- Stainless Steel 316H Seamless Tubes
Stainless Steel Seamless Tube Manufacturing Process
Understanding the Stainless Steel Seamless Tube Manufacturing Process
Stainless steel seamless tubes are manufactured using premium quality stainless steel billets through rotary piercing and rolling processes. Since no welding is involved, seamless tubes provide superior strength, excellent pressure resistance, accurate dimensions and reliable performance for critical industrial applications.
| Step 1 |
Raw Material (Billet) High quality stainless steel billets are selected according to the required tube grade, size and application standards. |
|---|---|
| Step 2 |
Heating The stainless steel billets are heated in a furnace to the required temperature to make the material suitable for seamless tube formation. |
| Step 3 |
Piercing The heated billet is pierced using a pointed mandrel to create a hollow shell, which forms the base structure of the seamless tube. |
| Step 4 |
Elongating (Mannesmann Mill) The hollow shell is elongated and thinned through rolling between angled rolls to achieve the required tube dimensions. |
| Step 5 |
Sizing The tube passes through a sizing mill to obtain accurate outside diameter and wall thickness with dimensional precision. |
| Step 6 |
Heat Treatment (Solution Annealing) The tubes undergo controlled heat treatment and rapid cooling to improve corrosion resistance, mechanical strength and metallurgical properties. |
| Step 7 |
Pickling Tubes are pickled in acid solutions to remove oxide scale and surface impurities, ensuring a clean and corrosion-resistant finish. |
| Step 8 |
Straightening Precision straightening machines are used to improve straightness and maintain dimensional accuracy. |
| Step 9 |
Cutting The seamless tubes are cut into required lengths according to customer specifications and industrial standards. |
| Step 10 |
Testing & Inspection Each tube undergoes dimensional inspection, chemical analysis, mechanical testing and non-destructive testing such as UT, ET and hydro testing to ensure product quality. |
| Step 11 |
Finished Product The finished stainless steel seamless tubes are cleaned, marked, packed and prepared for safe dispatch to domestic and international customers. |
Chemical Composition of Stainless Steel Seamless Tubes
Stainless steel seamless tubes are manufactured using various stainless steel grades with controlled chemical composition to ensure excellent corrosion resistance, strength and long service life. The alloying elements such as chromium, nickel and molybdenum improve durability and performance in industrial applications.
| Grade | Cr % | Ni % | Mo % | C % | Mn % | Si % |
|---|---|---|---|---|---|---|
| 304 / 304L | 18.0 – 20.0 | 8.0 – 13.0 | — | 0.08 max / 0.03 max | 2.0 max | 1.0 max |
| 316 / 316L | 16.0 – 18.0 | 10.0 – 14.0 | 2.0 – 3.0 | 0.08 max / 0.03 max | 2.0 max | 1.0 max |
| 321 | 17.0 – 19.0 | 9.0 – 12.0 | — | 0.08 max | 2.0 max | 1.0 max |
| 347 | 17.0 – 19.0 | 9.0 – 13.0 | — | 0.08 max | 2.0 max | 1.0 max |
| 904L | 19.0 – 23.0 | 23.0 – 28.0 | 4.0 – 5.0 | 0.02 max | 2.0 max | 1.0 max |
Stainless Steel Seamless Tube Sizes & Dimensions
Tube Thickness & Wall Thickness Chart
| Nominal Pipe Size (NPS) | Outside Diameter (OD) mm | SCH 5S (mm) | SCH 10S (mm) | SCH 40S (mm) | SCH 80S (mm) | SCH 160S (mm) |
|---|---|---|---|---|---|---|
| 1/8" | 10.29 | 1.24 | 1.24 | 1.73 | 2.41 | 3.02 |
| 1/4" | 13.72 | 1.65 | 1.65 | 2.24 | 3.02 | 3.73 |
| 3/8" | 17.15 | 1.65 | 1.65 | 2.31 | 3.20 | 3.91 |
| 1/2" | 21.34 | 1.65 | 2.11 | 2.77 | 3.73 | 4.78 |
| 3/4" | 26.67 | 1.65 | 2.11 | 2.87 | 3.91 | 5.56 |
| 1" | 33.40 | 1.65 | 2.77 | 3.38 | 4.55 | 6.35 |
| 1 1/4" | 42.16 | 1.65 | 2.77 | 3.56 | 4.85 | 6.35 |
| 1 1/2" | 48.26 | 1.65 | 2.77 | 3.68 | 5.08 | 7.14 |
| 2" | 60.33 | 1.65 | 2.77 | 3.91 | 5.54 | 8.74 |
| 2 1/2" | 73.03 | 2.11 | 3.05 | 5.16 | 7.01 | 9.53 |
| 3" | 88.90 | 2.11 | 3.05 | 5.49 | 7.62 | 11.13 |
| 4" | 114.30 | 2.11 | 3.05 | 6.02 | 8.56 | 13.49 |
| 5" | 141.30 | 2.77 | 3.40 | 6.55 | 9.53 | 15.88 |
| 6" | 168.28 | 2.77 | 3.40 | 7.11 | 10.97 | 18.26 |
| 8" | 219.08 | 2.77 | 3.76 | 8.18 | 12.70 | 23.01 |
| 10" | 273.05 | 3.40 | 4.19 | 9.27 | 15.09 | 28.58 |
| 12" | 323.85 | 3.96 | 4.57 | 9.53 | 17.48 | 33.32 |
Stainless Steel Seamless Tube Standards
| ASTM Standards | ASME Standards | ANSI Standards |
|---|---|---|
| ASTM A213 | ASME SA213 | ANSI B36.19 |
| ASTM A269 | ASME SA269 | - |
| ASTM A249 | ASME SA249 | - |
| ASTM A554 | - | - |
Mechanical Properties of Stainless Steel Seamless Tubes
Tensile Strength
Tensile strength indicates the maximum stress stainless steel seamless tubes can withstand before failure. High tensile strength makes these tubes suitable for pressure systems, heat exchangers and critical industrial applications.
Yield Strength
Yield strength represents the stress level at which permanent deformation begins. Stainless steel seamless tubes provide reliable yield strength for applications involving high pressure and mechanical load conditions.
Elongation
Elongation measures ductility and the ability of seamless tubes to bend or expand without cracking. Higher elongation improves fabrication, forming and installation performance.
| Grade | Tensile Strength (MPa, min) | Yield Strength (MPa, min) | Elongation (% min) |
|---|---|---|---|
| SS 304 | 515 | 205 | 40% |
| SS 304L | 485 | 170 | 40% |
| SS 316 | 515 | 205 | 40% |
| SS 316L | 485 | 170 | 40% |
| SS 321 | 515 | 205 | 40% |
| SS 904L | 490 | 220 | 35% |
Features of Stainless Steel Seamless Tubes
- Excellent Corrosion Resistance: Stainless steel seamless tubes provide excellent resistance against rust, moisture, chemicals and corrosive environments for long-term industrial use.
- High Temperature Performance: These tubes maintain strength and dimensional stability under elevated temperature and pressure conditions.
- Seamless Construction: Manufactured without welded joints, seamless tubes offer better structural integrity and leak-proof performance.
- Smooth Surface Finish: Smooth internal and external surfaces improve flow efficiency and reduce scaling or contamination risks.
- High Pressure Resistance: Stainless steel seamless tubes are suitable for high-pressure systems and critical industrial applications.
- Accurate Dimensions: Precision manufacturing ensures uniform wall thickness and dimensional accuracy for reliable installation.
- Excellent Fabrication Properties: These tubes can be easily bent, expanded, welded and fabricated according to industrial requirements.
- Long Service Life: Stainless steel seamless tubes provide durable performance even in aggressive and demanding environments.
- Low Maintenance: Due to superior corrosion resistance and durability, these tubes require minimal maintenance during operation.
- Suitable for Critical Applications: Ideal for industries requiring reliable, contamination-free and high-performance tubing systems.
Applications of Stainless Steel Seamless Tubes
Stainless steel seamless tubes are widely used in industries requiring high corrosion resistance, dimensional accuracy and reliable pressure handling performance.
Oil & Gas Industry
Used for fluid transportation, instrumentation systems and high-pressure applications in offshore and onshore operations.
Chemical Processing Plants
Suitable for handling corrosive chemicals, acids and industrial process fluids safely.
Heat Exchanger Systems
Widely used in heat exchangers and condensers because of their temperature resistance and smooth internal finish.
Power Generation Plants
Applied in steam pipelines, boilers and thermal power systems operating under high pressure and temperature.
Pharmaceutical Industry
Preferred for hygienic and contamination-free fluid transfer applications in pharmaceutical manufacturing.
Food & Beverage Industry
Used in sanitary processing systems requiring corrosion-resistant and clean tubing surfaces.
Water Treatment Plants
Suitable for desalination, filtration and water purification systems because of corrosion-resistant properties.
Aerospace Industry
Used in aerospace tubing systems where strength, reliability and lightweight performance are important.
Marine Industry
Marine applications require durable and corrosion-resistant tubing systems capable of handling seawater exposure.
General Engineering
Widely used in industrial fabrication, instrumentation and mechanical engineering applications.
Industries We Serve
Kamal Steels supplies stainless steel seamless tubes to various industries worldwide for precision tubing and corrosion-resistant applications.
Petrochemical Industry
Our seamless tubes are widely used in petrochemical processing systems operating under harsh conditions.
Chemical Industry
Chemical plants use stainless steel seamless tubes for safe handling of corrosive fluids and chemicals.
Energy & Power Industry
Used in boilers, condensers and thermal systems requiring reliable high-temperature tubing solutions.
Pharmaceutical Industry
Pharmaceutical plants require hygienic and precision tubing systems for clean process operations.
Offshore & Marine Industry
Marine environments require corrosion-resistant seamless tubes for seawater and offshore systems.
Engineering Industry
Engineering sectors use stainless steel seamless tubes for fabrication, instrumentation and mechanical systems.
Automobile Industry
Used in automotive exhaust, fuel and hydraulic systems requiring durable tubing solutions.
Packaging, Testing & Inspection
Packaging
- Wooden Boxes: Stainless steel seamless tubes are packed securely in wooden boxes for safe transportation and export handling.
- Bundle Packing: Tubes are bundled properly for easy loading, unloading and storage during shipment.
- Plastic End Caps: Protective caps are used to prevent dust, moisture and external damage during transit.
- Export Standard Packaging: All products are packed according to international export standards for safe global delivery.
- Surface Protection: Protective wrapping is used to maintain surface finish and prevent scratches during handling.
Testing & Inspection
- Hydrostatic Testing: Ensures tubes can withstand high internal pressure without leakage or failure.
- Ultrasonic Testing: Detects internal defects and confirms structural integrity of seamless tubes.
- PMI Testing: Positive Material Identification verifies material composition and grade accuracy.
- Eddy Current Testing: Ensures surface quality and detects defects in tubing systems.
- Flattening & Flaring Tests: Evaluates tube flexibility, expansion capability and fabrication performance.
- Visual & Dimensional Inspection: Confirms surface finish, straightness and dimensional accuracy according to standards.
- Third Party Inspection: Independent inspection agencies verify quality compliance before dispatch.
Frequently Asked Questions
Kamal Steels is a leading stainless steel seamless tube manufacturer in India, supplying high-quality seamless tubes for industrial, engineering and process applications worldwide.
A stainless steel seamless tube is manufactured without any welded seam, providing superior strength, corrosion resistance and pressure handling capability.
We supply seamless tubes in grades such as 304, 304L, 316, 316L, 321, 347 and 904L for different industrial applications.
Kamal Steels offers seamless tube sizes in mm and inch dimensions with different wall thicknesses and schedules according to customer requirements.
Our seamless tubes are supplied according to ASTM A213, ASTM A269, ASTM A249 and ASME standards.
Stainless steel seamless tubes are widely used in heat exchangers, condensers, hydraulic systems, instrumentation lines, chemical plants and power generation industries.
Seamless tubes are manufactured without welding and offer better pressure resistance, strength and reliability compared to welded tubes.
Yes, Kamal Steels supplies seamless square tubes and seamless rectangular tubes for industrial and structural applications.
We perform hydrostatic testing, ultrasonic testing, PMI testing, flattening tests and dimensional inspections to ensure quality.
You can request a quote by sharing your required grade, tube size, wall thickness, quantity and application details with our sales team.